Stepping onto the bus, the two friends giggle nervously, their secret plan unfolding. As the engine roars to life, so does their excitement. They lock the bathroom door, lift their dresses, and start pissing freely, the stream splashing onto the floor. The sound of their flowing urine echoes in the tiny space, and they can't help but laugh, their hands rubbing their clits, turned on by their naughty public display.